How long will a chest freezer run on a 100Ah 12V LiFePO4 battery?

A chest freezer drawing about 100 W will run roughly 9.1 hours on a 100Ah 12V LiFePO4 battery (using ~80% usable capacity and typical inverter loss). Lead-acid of the same rating gives less, because only about 50% is usable.

How many watts does a chest freezer use?

A typical chest freezer draws around 100 W, though actual draw varies by model and, for motor-driven appliances, cycles on and off.

Battery run-time

How long will a chest freezer run on a battery?

A chest freezer draws about 100 W. How long it runs depends on your battery's capacity, voltage and chemistry. Adjust the values below for your exact setup — the estimate updates live.

Battery capacity (Ah)

Battery voltage (V)

chest freezer load (W)

Chemistry

What changes the run-time

Three things move the number: your battery's usable capacity (chemistry sets how much you can safely draw — about 80% for LiFePO4, 50% for lead-acid), the chest freezer's actual power draw (rated watts can differ from running watts, and motors cycle on and off), and inverter losses if you run it on AC. This estimate accounts for usable depth of discharge and typical inverter loss.

To size a complete system around a chest freezer and other loads, use the full system calculator.

Battery run-time calculator

Usable capacity calculator

All run-time guides

Estimates for planning only. Verify with a meter; see the methodology.

How long will a chest freezer run on a battery?

What changes the run-time

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